（二）、合理施肥的指标1、施肥的形态指标a.相貌 b.叶色2、施肥的生理指标a.营养元素 营养临界浓度（critical concentration）：获得最高产量的最低 养分浓度。 b.
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safe critical concentration 安全临界浓度
limited critical concentration 极限临界浓度
Critical Concentration Index 浓度临界指数
critical micelle concentration 临界胶束浓度 ; 临界胶囊浓度 ; 束浓度
cl-critical concentration 临界cl
critical concentration of P P临界浓度
Critical Concentration of Micelle formation 胶态离子形成临界浓度 ; 形成临界浓度
critical aggregation concentration 临界聚集浓度 ; 的临界聚集浓度 ; 其临界聚集浓度 ; 揭示了临界聚集浓度
At the same time, the refined structure of lyotropic liquid crystal of SA was studied. The typical polygon showed up at the critical concentration(5% by wt.
同时研究了SA水溶液在临界浓度5％(重量比)时，用浇铸法制得的SA薄膜，呈现出典型的多角形结构。
参考来源 - 原子力显微镜对海藻酸钠自组装膜体系及其相关性质的研究The main findings are as follows:(1) Toxic critical concentration of Cu to the different types of plants is of a difference. In the copper pollution soil, the toxic critical concentration of Cu to Callistephus chinensis (Linn.
主要研究结果如下：(1)铜对不同种类植物产生毒害作用的临界浓度有差别。
参考来源 - 铜污染土壤的超富集植物筛选The critical concentration of copper ion was 5.99mg L~(-1) in anaerobic fermentation in normal temperature while 6.1mg L~(-1) in intermediate temperature for concentration of COD in effluent is the most important criterion of livestock wastewater discharge standards.
由于在养殖废水排放标准中出水COD浓度是最重要的指标,由试验得知,常温厌氧发酵下Cu离子胁迫浓度为5.99mgL~(-1),中温厌氧发酵下为6.1mgL~(-1)。
参考来源 - Cu对猪场废水厌氧—好氧生物处理的影响·2,447,543篇论文数据，部分数据来源于NoteExpress
Available Pb may unify the critical concentration of Pb in various soils.
用有效态铅为指标有可能使不同土壤铅临界浓度比较接近一致。
It will have effect on the growth and yield of crops when the copper content in soil is over a critical concentration.
当土壤中铜含量超过一定浓度时，将对作物生长发育及产量产生影响。
These low critical concentration values also imply that the chain rigidity of chitosan is larger than that of cellulosic chain.
低的临界浓度值表明壳聚糖的链刚性比纤维素的大。
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